My Sleeping Hours - Sample Project

Hi, 

1. I sleep at least 7 hours a day and my average is between 6 to 7 hours. 

2. Based on my knowledge, its 7 to 8 hours is must. 

Thanks
_Crystal. 

p.s; Make it as simple as possible; if you would like to write detailed answers, YOUR ARE WELCOME too. 
Would like to hear from you.